Hi,
I was just thinking, if outgassing is a major factor here, shouldn't the
pressure inside the Nixie tube increase due to these extra molecules
floating around?
Also, if the pressure was too low the digit would become hazy while
increasing the pressure does not significantly alter the appearance of
the glow. Found this out while experimenting with a broken CD47 under a
vacuum bell and some Penning mixture.
Jens
Thanks Jeff, I assume there isn't really anything that can be done to
this then.
I could still use them for a clock I think as there isn't really
anything wrong with them once they ionize.
Michel
On Sep 1, 8:14 am, Jeff Thomas <[email protected]> wrote:
Good question.
There are a few factors involved. Varying penning gas pressure/mix, process
variations in materials assembly and burn-in, and the possibility of
residual oxygen. We know that KR85, if introduced to assist in ionization
would be long gone.
I've experienced the same in testing volumes of other nixie tubes over the
years, and I'd just chocked it up process variations when frit seal failure
couldn't be the cause.
Regards, Jeff
On Friday, August 31, 2012 2:47:37 PM UTC-7, Michel wrote:
After making a couple of batches of watches, I noticed that some tubes
(about 1 out of 40) occasionally ionize very slowly when driven by a
low current. This doesn't always happen, sometimes they ionize just as
quick as other tubes, but occasionally it can take more than 1 second
before the gas ionizes. Once they ionize, they look just as bright as
the other tubes, there really is no difference. When I replace the
slow tube with another one, the problem disappears.
Why is that? I was thinking could the pressure of the gas inside the
tube be a bit too low after about 40 years not being used? But
wouldn't that influence the brightness as well?
Michel
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